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Antique Sonoptophore

Discussion in 'General Electronics Discussion' started by brunocville, Sep 29, 2013.

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  1. brunocville

    brunocville

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    Sep 29, 2013
    Greetings, I am restoring an antique sonoptophore, which is used for vision therapy.
    Its age dates circa 1920s so the power outlets did not provide a ground, the neutral wire is bonded to the metal casing. I have two questions:
    Where is the best place to purchase the 100w, 80-100ohm pot/rheostat , and what is the coil in attached pic used for in this circuit? I have not seen one before, my father thinks he's seen them in old amplifiers. It's wired in series with the circuit and mounted on a ferrous pole with a brass nut. To me it would generate a small magnetic field, but what purpose does it serve? Any help would be great.

    Thanks!
    Anthony
     

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    Last edited: Sep 29, 2013
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